240 



The space between the horn-cores extending across the forehead Conns a 

 deep concavity divergent outwardly- The surface of the forehead from the 

 broken border of the specimen behind to the end of the nasals forms a mod- 

 erate uninterrupted convexity. In Sivatheriura, the rhinoceros, and the tapir, 

 the corresponding surface is interrupted by a concavity at the root of the nose. 



The face, as formed by the nasals and their apparent conjunction with the 

 maxillaries in advance of the position of the horn-cores, is exceedingly short 

 in comparison with the corresponding part in Sivatherium and the rhinoceros, 

 and is more like that in the tapir. 



The nasals together form a strong, thick, tongue-like process, projecting 

 free from their conjunction with the frontals in advance of the horn-cores. 

 The overhanging process of the nose is proportionately wider, thicker, and 

 longer than that of Sivatherium. Its upper surface is not vaulted as in the 

 latter and the rhinoceros, but simply continues the convexity of the forehead. 

 The lateral margins are somewhat expanded, (not sufficiently expressed in 

 Fig. 2, Plate I,) and are thinner than elsewhere. The end is thicker than at 

 the sides, is more obtuse than in Sivatherium or the tapir, and is roughened 

 q,nd porous, probably to have given firmer attachment to a proboscis. A 

 notch occupies the extremity of the obliterated internasal suture. 



One of the most remarkable characters of the Colorado fossil is the great 

 comparative extent of the lateral nasal notch. It not only exceeds that of 

 Sivatherium, but also that of the rhinoceros and tapir. In the former its 

 bottom is far in advance of the position of the horn-cores, and in the rhi- 

 noceros it holds nearly the same relative position. In the tapir the notch 

 extends back over the position of the orbits. In the Colorado fossil it 

 extends far back beneath the position of the horn-cores, where the nasals 

 apparently conjoin the maxillaries. The relative position of the orbits cannot 

 be ascertained in our fossil, as all the contiguous parts are broke*! away. 

 They appear as if they had been situated farther posteriorly in relation with 

 the position of the horn-cores than in Sivatherium. The horn-cores, project- 

 ing forward and outward, overhang a large recess, which would appear to 

 have been just in advance of the orbit, and is situated externally above and 

 behind the lateral nasal notch. 



The broad and stout projecting nasals were probably intended as a point ' 

 of attachment for a movable snout or proboscis, intermediate in degree of 

 development to that of the tapir and elephant or mastodon. The similar 



